我有一个使用net.schmizz.sshjSFTP 库的夜间工作。
我怀疑我们 SFTP 进入的服务器发生了变化。但是，我无法确定确切的变化是什么。我也不能在生产服务器之外复制它。所以我正在寻找根本原因的洞察力或如何重现以下错误
net.schmizz.sshj.transport.TransportException: Timeout expired
at net.schmizz.sshj.transport.TransportException$1.chain(TransportException.java:33)
at net.schmizz.sshj.transport.TransportException$1.chain(TransportException.java:27)
at net.schmizz.concurrent.Promise.retrieve(Promise.java:139)
at net.schmizz.concurrent.Event.await(Event.java:103)
at net.schmizz.sshj.transport.KeyExchanger.waitForDone(KeyExchanger.java:160)
at net.schmizz.sshj.transport.KeyExchanger.startKex(KeyExchanger.java:155)
at net.schmizz.sshj.transport.TransportImpl.doKex(TransportImpl.java:247)
at net.schmizz.sshj.SSHClient.doKex(SSHClient.java:735)
at net.schmizz.sshj.SSHClient.onConnect(SSHClient.java:723)
at net.schmizz.sshj.SocketClient.connect(SocketClient.java:54)
at net.schmizz.sshj.SocketClient.connect(SocketClient.java:80)
据我所知，我们通过java.net.Socketok 连接，然后超时等待密钥交换在此代码中完成
package net.schmizz.sshj.transport;
/** Algorithm negotiation and key exchange. */
final class KeyExchanger
implements SSHPacketHandler, ErrorNotifiable {
/**
* Starts key exchange by sending a {@code SSH_MSG_KEXINIT} packet. Key exchange needs to be done once mandatorily
* after initializing the {@link Transport} for it to be usable and may be initiated at any later point e.g. if
* {@link Transport#getConfig() algorithms} have changed and should be renegotiated.
*
* @param waitForDone whether should block till key exchange completed
*
* @throws TransportException if there is an error during key exchange
* @see {@link Transport#setTimeoutMs} for setting timeout for kex
*/
void startKex(boolean waitForDone)
throws TransportException {
if (!kexOngoing.getAndSet(true)) {
done.clear();
sendKexInit();
}
if (waitForDone)
waitForDone();
}
/**
* Sends SSH_MSG_KEXINIT and sets the {@link #kexInitSent} event.
*
* @throws TransportException
*/
private void sendKexInit()
throws TransportException {
log.debug("Sending SSH_MSG_KEXINIT");
clientProposal = new Proposal(transport.getConfig());
transport.write(clientProposal.getPacket());
kexInitSent.set();
}
void waitForDone()
throws TransportException {
done.await(transport.getTimeoutMs(), TimeUnit.MILLISECONDS);
}